How are earthworms bristle worms and leeches alike?

Earthworms, bristle worms, and leeches are all segmented worms belonging to the phylum Annelida. They share a similar body structure characterized by a series of repeating segments, which contributes to their flexibility and movement. Additionally, all three groups have a coelom, a fluid-filled body cavity that aids in circulation and organ development. Despite their differences in habitat and lifestyle, they all play important roles in their respective ecosystems.